Temperature compensation circuit

• US 8,212,605 B2
• Filed: 01/13/2010
• Issued: 07/03/2012
• Est. Priority Date: 01/15/2009
• Status: Expired due to Fees

• Current Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Original Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Inventors: Horie, Koji, Nagata, Minoru
• Primary Examiner(s): Donovan, Lincoln
• Assistant Examiner(s): ENGLUND, TERRY LEE
• Application Number:
  US12/686,613
• Publication Number:
  US 20100176869A1
• Time in Patent Office: 902 Days
• Field of Search: None
• US Class Current: 327/513
• CPC Class Codes: H03F 1/302 in bipolar transistor amplifiers H03F1/303, H03F1/305, H03F1/307 take precedence
• CPC Class Codes: H03F 2200/447 the amplifier being protected to temperature influence
• CPC Class Codes: H03F 2200/451 the amplifier being a radio frequency amplifier
• CPC Class Codes: H03F 3/195 in integrated circuits
• CPC Class Codes: H03F 3/245 with semiconductor devices only

Abstract

A temperature compensation circuit includes a bias circuit configured to output a bias current having a current value increasing in proportion to an absolute temperature in a low-temperature region in which a temperature is lower than a predetermined temperature, and having a greater current value than the current value proportional to the absolute temperature in a high-temperature region in which the temperature is equal to or greater than the predetermined temperature, and a transistor having a control terminal supplied with the bias current. The bias circuit includes a first current generating circuit configured to generate a first current increasing in proportion to the absolute temperature, a second current generating circuit configured to generate a second current that does not flow in the low-temperature region and flows in the high-temperature region, and a control circuit configured to control the second current and having a connection terminal capable of being connected with an external resistor for adjusting a magnitude of the second current, and is configured to generate a third current by adding the first current to the second current, and output the bias current depending on or equal to the third current.

Claims

1. A temperature compensation circuit comprising:

a bias circuit configured to output a bias current having a current value increasing in proportion to an absolute temperature in a low-temperature region in which a temperature is lower than a predetermined temperature, and having a greater current value than the current value proportional to the absolute temperature in a high-temperature region in which the temperature is equal to or greater than the predetermined temperature; and

a transistor having a control terminal supplied with the bias current, the bias circuit comprising;

a first current generating circuit configured to generate a first current increasing in proportion to the absolute temperature;

a second current generating circuit configured to generate a second current that does not flow in the low-temperature region and flows in the high-temperature region; and

a control circuit configured to control the second current and having a connection terminal capable of being connected with an external resistor for adjusting a magnitude of the second current,

the bias circuit being configured to generate a third current by adding the first current to the second current, and output the bias current that is the third current or a fourth current depending on the third current.

2. The compensation circuit according to claim 1, wherein

the control circuit is configured to control the first and second currents, and

a magnitude of the first current and the magnitude of the second current are capable of being adjusted by the external resistor.

3. The compensation circuit according to claim 1, wherein

only the magnitude of the second current is capable of being adjusted by the external resistor, with respect to a magnitude of the first current and the magnitude of the second current.

4. The compensation circuit according to claim 1, wherein

a height of the predetermined temperature is capable of being adjusted by adjusting the second current with the external resistor.

5. The compensation circuit according to claim 1, wherein

the transistor further includes a first main terminal connected to a power supply terminal, and a second main terminal connected to a ground line to output an output current, and is configured to serve as a power amplifier.

6. The compensation circuit according to claim 1, wherein

the second current generating circuit comprises a differential amplifier configured to generate the second current.